Sakamoto Days throws us into a world where legendary assassins live ordinary lives, but one sniper breaks this mold entirely. Heisuke Mashimo lives in a worn-out tent on rooftops, with only his rifle and a bird named Piisuke, yet his sharpshooting is so precise it rattles even the most experienced assassins.
Heisuke Mashimo stands as Sakamoto Days' most contradictory character—a 21-year-old master marksman who fails at everything except pulling triggers. His backstory reveals an academy graduate turned homeless delivery boy, living proof that exceptional talent means nothing without adaptability. Born with supernatural precision but cursed with childlike naivety.
Mashimo’s spiky brown hair rims black eyes that differ sharply from his fair complexion. The most notable part remains the crosshair tattoo on his right cheek, signifying his singular talent for accurate shooting.

His wardrobe reflects his circumstances. A black jacket with green accents covers camouflage shorts, while his ever-present backpack carries essential equipment. The bandage across his nose bridge tells stories of past struggles, making him instantly recognizable in Sakamoto Days' visual landscape.
Sakamoto Days present Mashimo as fundamentally childlike despite his deadly profession. His simple-minded personality usually leads to misunderstandings that deliver comedic moments. The proneness of inserting "Yo" into sentences adds linguistic charm to his dialogue. Despite his profession, he shows true care for children and maintains strong moral principles against dishonesty.
Tragic Backstory and Academy Days in Sakamoto Days
The academy years shaped Mashimo's entire worldview. While excelling at sharpshooting, he struggled with every other aspect of assassin training. His graduation represented hope for a better future, but reality proved harsher than expected.

Rejected by multiple agencies, he had a hard time finding work because he lacked academic skills. This rejection spiral led to his current living status atop a building in a deteriorating tent. The only place he could call home was his grandmother’s old shelter in Sakamoto Days, where he lived alongside his faithful bird, Piisuke.
His custom-built bolt-action rifle shows years of improvement and modification. Every piece has been adjusted for maximum accuracy, assembling a weapon flawlessly suited to his unique fighting style. The ricochet rounds he employs enable tactical advantages that few snipers can match.
The bond between Mashimo and his bird companion adds emotional weight to Sakamoto Days' narrative. Piisuke serves multiple functions beyond simple companionship. The bird assists in battlefield reconnaissance, providing visibility advantages during missions.

Mashimo's integration into the main cast occurred through his failed assassination attempt on Taro Sakamoto. His initial deception at the store, where he left with pork buns instead of completing his mission, established his character's endearing incompetence outside his specialty.
The airsoft tournament became his proving ground. He began his journey toward joining Sakamoto’s team by showcasing his exceptional sharpshooting talent. This tournament arc emphasized both his strengths and emotional vulnerabilities. His current role as a delivery man for Sakamoto Store illustrates character growth.
As such, Heisuke Mashimo signifies everything that makes Sakamoto Days convincing. The combination of specialized skill and emotive vulnerability forms a character that outperforms typical assassin archetypes. Mashimo's presence assures that precision, loyalty, and heart stay central to the narrative.